Lock for cabinet doors and the like



Feb. 10. 1925. 1,526,110

' W. BACHMANN LOCK FOR CABINET DOORS AND THE LII-KE Filed Deo. 30, 1922Patented Feb. 10, 1925.

` UNITED STATES .P'A'rialv'rV oFFIcE.

WILHELM BACHMANN, 0F ZURICH, SWITZERLAND.

LOCK FOR CABINET DGORS AND 'III-IE LIKE.

Application led December 30, 1922. Serial No. 610,007.

This invention relates to alock ot the kind having two bolts which areshot in 4opposite directions, and its object is toproduceanon-obstructive lock which can be itted on cabinet doors or thelike without recessing the same except as far as required 1 for theintroduction ott the key.

This object is achieved by meansr'o't the invention which consists inthe provision oi a shallow elongated Casing containing a rev" `olublebarrel, two spring-pressed bolt-operated slides, and two links which arepivoted to the barrel and which bear against the slides, `the latterbeing shot or retracted 'by halt a revolution of the barrel andretained, in one position by the overlapping of the links across thebarrel and in the other position by the mutual abutment of the elementsat a point of the movement beyond the dead centre of the links. Y

Fig. 1 of the accompanying drawings rep- `resentsa sectional view of acabinet door to which the lock is attached,

Fig. 2, a view of the lock casing with the cover removed, y

Fig.` 3, a sectional view of the lock casing,

Fig. l1, a cross-section on the line A--A ot' Fig. 3,

Fig. 5, a cross-section on the line B-B of the same ligure, y

Fig. 6, a view of the key,

Fig. 7, a view of one of the guide plates,

Fig. 8, a; view of the interior of the lock showing thc bolt-operatingslides in retracted position,

Fig. 9, a similar view showing the slides in shot position,

Fig. 10, an enlarged view of the revolu* ble barrel and its links, and

Fig. 11, a view at right angles to Fig. 10.

The lock casing is composed of an elongated plate l having raised edges2 on which lits a cover 3. The latter carries a centrally disposedcylinder 7 which contains a rotatable guide block 9 for a fiat key 2Ohav ing a handle 21. through a slot 8 in the block behind which there isa ward plate or a plurality of plates l0 through Slot-S l? (Fie- 4)inwhch the u n n `cesses 31 V1n which to accommodate two coil The key isadmittedV key must pass. Each slot 12 has a central circular enlargement11 allowing the key to turn when notches 22 in the key register with theplates. The inner end of the cylin der 7 receives the reducedportion 18of a revoluble barrel 16, the latter being accom- -modated within thelock casing and guided therein by two plates 13 which conform with theshape o1 the casing, each plate having a central aperture 17 in which toreceive the barrel. There is in the portion 18 ot the barrel a diametralslit 19 into which the key 20 is admitted for turning the barrel. Thisslot is flared radially outwards so as to allow a slight movement of thekey relative to the barrel. Thus, without operating the lock mechanism,the key can be engaged to the ward plate or plates 10 and serve as ahandle for opening and shutting the door.

Between the plates 18 two slides 28 are arranged, one at each end of thelock casn The plates 13 are formed with resprings 30, each spring beingadapted to bear with one end against a shoulder 29 on one of the slides28 and with the other end against shoulders 82 on the plates 13. Thusthe slides 28 will be urged by the springs Atowards the barrel 16. Thelatter is formed with two segmental, circumferential recesses 23 (Fig.11) within each of which a link 25 is pivoted.` Each link has at one enda head 36, which receives the Vpivot pin 24 and at the other end a head26 which is in pivotal engagement with the inner circular portion 27 ofan otherwise triangular notch in one of the slides 28. The links conltrol the position of the slides. Fig. 8 shows the slide contracted; thelinks overlap across the barrel and no lurther contracting movement ispossible.

noA

The slit 19 of the barrel 16 is in alignment with the key slot in theplate or plates 10 so that the key can be introduced for opening thelock. By a turn on the bai`- rel through o, the slides 28 will be shot.

In this position, which is shown in Fig. 9,

the slides will be retained by the links which, having passed the deadcentre, tend to continue the movement of the barrel but are preventedfrom so doing by abutment against the edges-which conline the recessesin the slides and in the barrel.

The lock casing is held together by rivets 4f and is secured to theinner face of a cabinet door 6 or the like which is simply drilled,

to admit the cylinder 7. The fastening screws 5 and the rivets 4 passthrough elongated slots l5 in the plates 13 and in the slides.Extensions 33 of the slides are admitted through slots le in the ends ofthe casing, and these extensions are connected by pivot pins 35 to bars34 which operate the lock bolts, one at the top and the other at thebottom end of the door.

The different parts of the look can be stamped out ot sheet metal, and avery cheap and elicient lock will thus be obt-ained.

l claim l. A key-operated lock for cabinet doors and the like,comprising a shallow elongated casing, a centrally disposed cylinderprojecting from said casing at right angles, a guide block for the keyarranged rotatably within said cylinder, a revoluble barrel a-rrangedwithin the casing, said barrel having a reduced portion projecting int-0said cylinder :tor engagement with the key, two bolt-operating slidesarranged within and at opposite ends of the casing, springs tending tourge the slides towards the barrel, and links pivoted eccent-rically tothe barrel and supporting the slides so that the latter can be shot orretracted by half a revolution of the barrel, one end position of thebarrel being determined by the overlapping 't the links across thebarrel and the other end position by the abutment of the link flanksagainst the slides at a point of the movement beyond the dead center ofthe links.

2. A key-operated lock for cabinet doors and the like, comprising ashallow elongated casing, a centrally disposed cylinder projecting fromsaid casing at right angles, a guide block for the key arrangedrotatably within said cylinder, a slotted ward plate arranged in saidcylinder so as to engage notches in the key when the latter is turnedand prevent a withdrawal of the same,` a

revoluble barrel arranged within the casing, said barrel having areduced portion projecting into said cylinder, said reduced portionbeing formed with a diametral slit for engagement with the key, saidslit being shaped so as to allow a slight rotation of the key forengagement with said ward plate without afecting the barrel, twoboltoperating slides arranged within and at opposite ends of the casing,springs tending to urge said slides towards the barrel, and linkspivoted eccentrically to the barrel and supporting the slides so thatthe latter can be shot or retracted by half a revolution of the barrel,one end position ot tlie barrel being determined by the overlapping ofthe links across the barrel and the other end position by the abutmentof the link flanks against the slides at a point ot the movement beyondthe dead centre of the links.

3. A lock for cabinet doors and the like, comprising a shallowenlongated casing, two bolt-operating slides arranged inside and atopposite ends of said casing, springs tending to urge the slides towardsthe center of the casing, a key-operated revolnble barrel arrangedbetween the ends of the slides in the center of the casing, and linkspivoted eccentrically to the barrel and resting in notches in saidslides so that the latter can be shot or retracted by half a revolutionof the barrel, one end position of the barrel being determined by theoverlapping of the links across the barrel and the other end position bythe abutment of the links against the edges of the slide notches at apoint of the movement beyond the dead center of the links.

VILHELM BACHMANN.

